diff --git a/.editorconfig b/.editorconfig
new file mode 100644
index 0000000..c6c8b36
--- /dev/null
+++ b/.editorconfig
@@ -0,0 +1,9 @@
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..fdefc8c
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+.DS_Store
+*.log
+.nyc_output/
+coverage/
+node_modules/
+yarn.lock
diff --git a/.npmrc b/.npmrc
new file mode 100644
index 0000000..43c97e7
--- /dev/null
+++ b/.npmrc
@@ -0,0 +1 @@
+package-lock=false
diff --git a/.prettierignore b/.prettierignore
new file mode 100644
index 0000000..2ac20d2
--- /dev/null
+++ b/.prettierignore
@@ -0,0 +1,4 @@
+coverage/
+*.html
+*.json
+*.md
diff --git a/.remarkignore b/.remarkignore
new file mode 100644
index 0000000..65e3ba2
--- /dev/null
+++ b/.remarkignore
@@ -0,0 +1 @@
+test/
diff --git a/.travis.yml b/.travis.yml
new file mode 100644
index 0000000..e108609
--- /dev/null
+++ b/.travis.yml
@@ -0,0 +1,5 @@
+language: node_js
+node_js:
+  - lts/dubnium
+  - node
+after_script: bash <(curl -s https://codecov.io/bash)
diff --git a/html.js b/html.js
new file mode 100644
index 0000000..227dd9a
--- /dev/null
+++ b/html.js
@@ -0,0 +1 @@
+module.exports = require('./lib/html')
diff --git a/index.js b/index.js
new file mode 100644
index 0000000..624255d
--- /dev/null
+++ b/index.js
@@ -0,0 +1 @@
+module.exports = require('./lib/syntax')
diff --git a/lib/html.js b/lib/html.js
new file mode 100644
index 0000000..7f55b28
--- /dev/null
+++ b/lib/html.js
@@ -0,0 +1,10 @@
+exports.enter = {strikethrough: onenterstrikethrough}
+exports.exit = {strikethrough: onexitstrikethrough}
+
+function onenterstrikethrough() {
+  this.tag('<del>')
+}
+
+function onexitstrikethrough() {
+  this.tag('</del>')
+}
diff --git a/lib/syntax.js b/lib/syntax.js
new file mode 100644
index 0000000..cab2027
--- /dev/null
+++ b/lib/syntax.js
@@ -0,0 +1,156 @@
+var classifyCharacter = require('micromark/dist/util/classify-character')
+var shallow = require('micromark/dist/util/shallow')
+var resolveAll = require('micromark/dist/util/resolve-all')
+
+var characterGroupPunctuation = 2
+
+var tokenizer = {
+  tokenize: tokenizeStrikethrough,
+  resolveAll: resolveAllStrikethrough
+}
+
+exports.text = {126: tokenizer}
+exports.insideSpan = {null: tokenizer}
+
+// Take events and resolve strikethrough.
+function resolveAllStrikethrough(events, context) {
+  var length = events.length
+  var index = -1
+  var strikethrough
+  var opening
+  var closing
+  var text
+  var indexOpen
+  var eventsUpTo
+
+  // Walk through all events.
+  while (++index < length) {
+    closing = events[index][1]
+
+    // Find a token that can close.
+    if (closing.type === 'strikethroughSequenceTemporary' && closing._close) {
+      indexOpen = index
+
+      // Now walk back to find an opener.
+      while (indexOpen--) {
+        opening = events[indexOpen][1]
+
+        // Find a token that can open the closer.
+        if (
+          opening.type === 'strikethroughSequenceTemporary' &&
+          opening._open &&
+          closing.end.offset - closing.start.offset ===
+            opening.end.offset - opening.start.offset &&
+          !(closing._open || opening._close)
+        ) {
+          closing.type = 'strikethroughSequence'
+          opening.type = 'strikethroughSequence'
+
+          strikethrough = {
+            type: 'strikethrough',
+            start: shallow(opening.start),
+            end: shallow(closing.end)
+          }
+
+          text = {
+            type: 'strikethroughText',
+            start: shallow(opening.end),
+            end: shallow(closing.start)
+          }
+
+          eventsUpTo = [].concat(
+            // Before.
+            events.slice(0, indexOpen - 1),
+            // Opening.
+            [
+              ['enter', strikethrough, context],
+              ['enter', opening, context],
+              ['exit', opening, context],
+              ['enter', text, context]
+            ],
+            // Between.
+            resolveAll(
+              context.parser.constructs.insideSpan.null,
+              events.slice(indexOpen + 1, index),
+              context
+            ),
+            // Closing.
+            [
+              ['exit', text, context],
+              ['enter', closing, context],
+              ['exit', closing, context],
+              ['exit', strikethrough, context]
+            ]
+          )
+
+          // After.
+          events = eventsUpTo.concat(events.slice(index + 2))
+          length = events.length
+          index = eventsUpTo.length - 1
+          break
+        }
+      }
+    }
+  }
+
+  return removeRemainingSequences(events)
+}
+
+function removeRemainingSequences(events) {
+  var index = -1
+  var length = events.length
+
+  while (++index < length) {
+    if (events[index][1].type === 'strikethroughSequenceTemporary') {
+      events[index][1].type = 'data'
+    }
+  }
+
+  return events
+}
+
+function tokenizeStrikethrough(effects, ok, nok) {
+  var previous = this.previous
+  var events = this.events
+  var size = 0
+
+  return start
+
+  function start(code) {
+    if (
+      code !== 126 ||
+      (previous === 126 &&
+        events[events.length - 1][1].type !== 'characterEscape')
+    ) {
+      return nok(code)
+    }
+
+    effects.enter('strikethroughSequenceTemporary')
+    return more(code)
+  }
+
+  function more(code) {
+    var token
+    var before
+    var after
+
+    if (code === 126) {
+      // If this is the third marker, exit.
+      if (size > 1) {
+        return nok(code)
+      }
+
+      effects.consume(code)
+      size++
+      return more
+    }
+
+    before = classifyCharacter(previous)
+    after = classifyCharacter(code)
+    token = effects.exit('strikethroughSequenceTemporary')
+    token._open = !after || (before && after === characterGroupPunctuation)
+    token._close = !before || (after && before === characterGroupPunctuation)
+
+    return ok(code)
+  }
+}
diff --git a/license b/license
new file mode 100644
index 0000000..3937235
--- /dev/null
+++ b/license
@@ -0,0 +1,22 @@
+(The MIT License)
+
+Copyright (c) 2020 Titus Wormer <tituswormer@gmail.com>
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+'Software'), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
+SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
diff --git a/package.json b/package.json
new file mode 100644
index 0000000..3f26b23
--- /dev/null
+++ b/package.json
@@ -0,0 +1,75 @@
+{
+  "name": "micromark-extension-gfm-strikethrough",
+  "version": "0.0.0",
+  "description": "micromark extension to support GFM strikethrough",
+  "license": "MIT",
+  "keywords": [
+    "micromark",
+    "micromark-extension",
+    "strikethrough",
+    "strike",
+    "through",
+    "del",
+    "delete",
+    "deletion",
+    "gfm",
+    "markdown",
+    "unified"
+  ],
+  "repository": "micromark/micromark-extension-gfm-strikethrough",
+  "bugs": "https://github.com/micromark/micromark-extension-gfm-strikethrough/issues",
+  "funding": {
+    "type": "opencollective",
+    "url": "https://opencollective.com/unified"
+  },
+  "author": "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)",
+  "contributors": [
+    "Titus Wormer <tituswormer@gmail.com> (https://wooorm.com)"
+  ],
+  "files": [
+    "lib/",
+    "index.js",
+    "html.js"
+  ],
+  "dependencies": {
+    "fault": "^1.0.0",
+    "micromark": "^2.3.0"
+  },
+  "devDependencies": {
+    "nyc": "^15.0.0",
+    "prettier": "^2.0.0",
+    "remark-cli": "^8.0.0",
+    "remark-preset-wooorm": "^7.0.0",
+    "tape": "^5.0.0",
+    "xo": "^0.33.0"
+  },
+  "scripts": {
+    "format": "remark . -qfo && prettier . -w --loglevel warn && xo --fix",
+    "test-api": "node test",
+    "test-coverage": "nyc --reporter lcov tape test/index.js",
+    "test": "npm run format && npm run test-coverage"
+  },
+  "nyc": {
+    "check-coverage": true,
+    "lines": 100,
+    "functions": 100,
+    "branches": 100
+  },
+  "prettier": {
+    "tabWidth": 2,
+    "useTabs": false,
+    "singleQuote": true,
+    "bracketSpacing": false,
+    "semi": false,
+    "trailingComma": "none"
+  },
+  "xo": {
+    "prettier": true,
+    "esnext": false
+  },
+  "remarkConfig": {
+    "plugins": [
+      "preset-wooorm"
+    ]
+  }
+}
diff --git a/readme.md b/readme.md
new file mode 100644
index 0000000..ade081f
--- /dev/null
+++ b/readme.md
@@ -0,0 +1,126 @@
+# micromark-extension-gfm-strikethrough
+
+[![Build][build-badge]][build]
+[![Coverage][coverage-badge]][coverage]
+[![Downloads][downloads-badge]][downloads]
+[![Size][size-badge]][size]
+[![Sponsors][sponsors-badge]][collective]
+[![Backers][backers-badge]][collective]
+[![Chat][chat-badge]][chat]
+
+**[micromark][]** extension to support GitHub flavored markdown strikethrough
+(~~like this~~).
+
+This package provides the low-level modules for integrating with the micromark
+tokenizer and the micromark HTML compiler.
+
+While GFM defines [strikethrough][], GitHub does not adhere to their
+specification.
+This syntax extension matches the GitHub parser, not the specification.
+
+You probably shouldn’t use this package directly, but instead use
+[`mdast-util-gfm-strikethrough`][mdast-util-gfm-strikethrough] with
+**[mdast][]**.
+
+## Install
+
+[npm][]:
+
+```sh
+npm install micromark-extension-gfm-strikethrough
+```
+
+## API
+
+### `syntax`
+
+### `html`
+
+> Note: `syntax` is the default export of this module, html is available at
+> `micromark-extension-gfm-strikethrough/html`.
+
+Support strikethrough (~~like this~~)
+The exports are extensions, respectively for the micromark parser (to tokenize
+strikethrough, can be passed in `extensions`) and the default HTML compiler
+(to compile as a `<del>` element, can be passed in `htmlExtensions`).
+
+## Related
+
+*   [`remarkjs/remark`][remark]
+    — markdown processor powered by plugins
+*   [`micromark/micromark`][micromark]
+    — the smallest commonmark-compliant markdown parser that exists
+*   [`syntax-tree/mdast-util-gfm-strikethrough`][mdast-util-gfm-strikethrough]
+    — mdast utility to support strikethrough
+*   [`syntax-tree/mdast-util-from-markdown`][from-markdown]
+    — mdast parser using `micromark` to create mdast from markdown
+*   [`syntax-tree/mdast-util-to-markdown`][to-markdown]
+    — mdast serializer to create markdown from mdast
+
+## Contribute
+
+See [`contributing.md` in `micromark/.github`][contributing] for ways to get
+started.
+See [`support.md`][support] for ways to get help.
+
+This project has a [code of conduct][coc].
+By interacting with this repository, organization, or community you agree to
+abide by its terms.
+
+## License
+
+[MIT][license] © [Titus Wormer][author]
+
+<!-- Definitions -->
+
+[build-badge]: https://img.shields.io/travis/micromark/micromark-extension-gfm-strikethrough.svg
+
+[build]: https://travis-ci.org/micromark/micromark-extension-gfm-strikethrough
+
+[coverage-badge]: https://img.shields.io/codecov/c/github/micromark/micromark-extension-gfm-strikethrough.svg
+
+[coverage]: https://codecov.io/github/micromark/micromark-extension-gfm-strikethrough
+
+[downloads-badge]: https://img.shields.io/npm/dm/micromark-extension-gfm-strikethrough.svg
+
+[downloads]: https://www.npmjs.com/package/micromark-extension-gfm-strikethrough
+
+[size-badge]: https://img.shields.io/bundlephobia/minzip/micromark-extension-gfm-strikethrough.svg
+
+[size]: https://bundlephobia.com/result?p=micromark-extension-gfm-strikethrough
+
+[sponsors-badge]: https://opencollective.com/unified/sponsors/badge.svg
+
+[backers-badge]: https://opencollective.com/unified/backers/badge.svg
+
+[collective]: https://opencollective.com/unified
+
+[chat-badge]: https://img.shields.io/badge/chat-discussions-success.svg
+
+[chat]: https://github.com/micromark/unist/discussions
+
+[npm]: https://docs.npmjs.com/cli/install
+
+[license]: license
+
+[author]: https://wooorm.com
+
+[contributing]: https://github.com/micromark/.github/blob/HEAD/contributing.md
+
+[support]: https://github.com/micromark/.github/blob/HEAD/support.md
+
+[coc]: https://github.com/micromark/.github/blob/HEAD/code-of-conduct.md
+
+[micromark]: https://github.com/micromark/micromark
+
+[from-markdown]: https://github.com/syntax-tree/mdast-util-from-markdown
+
+[to-markdown]: https://github.com/syntax-tree/mdast-util-to-markdown
+
+[remark]: https://github.com/remarkjs/remark
+
+[mdast]: https://github.com/syntax-tree/mdast
+
+[mdast-util-gfm-strikethrough]: https://github.com/syntax-tree/mdast-util-gfm-strikethrough
+
+[strikethrough]: https://github.github.com/gfm/#strikethrough-extension-
diff --git a/test/index.js b/test/index.js
new file mode 100644
index 0000000..7a0bbad
--- /dev/null
+++ b/test/index.js
@@ -0,0 +1,82 @@
+var fs = require('fs')
+var path = require('path')
+var test = require('tape')
+var micromark = require('micromark')
+var syntax = require('..')
+var html = require('../html')
+
+var input = fs.readFileSync(path.join(__dirname, 'input.md'))
+var output = fs.readFileSync(path.join(__dirname, 'output.html'), 'utf8')
+
+test('markdown -> html (micromark)', function (t) {
+  t.deepEqual(
+    micromark('a ~b~', {
+      extensions: [syntax],
+      htmlExtensions: [html]
+    }),
+    '<p>a <del>b</del></p>',
+    'should support strikethrough w/ one tilde'
+  )
+
+  t.deepEqual(
+    micromark('a ~~b~~', {
+      extensions: [syntax],
+      htmlExtensions: [html]
+    }),
+    '<p>a <del>b</del></p>',
+    'should support strikethrough w/ two tildes'
+  )
+
+  t.deepEqual(
+    micromark('a ~~~b~~~', {
+      extensions: [syntax],
+      htmlExtensions: [html]
+    }),
+    '<p>a ~~~b~~~</p>',
+    'should not support strikethrough w/ three tildes'
+  )
+
+  t.deepEqual(
+    micromark(input, {extensions: [syntax], htmlExtensions: [html]}),
+    output,
+    'should support strikethrough matching how GH does it'
+  )
+
+  t.deepEqual(
+    micromark('a \\~~~b~~ c', {
+      extensions: [syntax],
+      htmlExtensions: [html]
+    }),
+    '<p>a ~<del>b</del> c</p>',
+    'should support strikethrough w/ after an escaped tilde'
+  )
+
+  t.deepEqual(
+    micromark('a ~~b ~~c~~ d~~ e', {
+      extensions: [syntax],
+      htmlExtensions: [html]
+    }),
+    '<p>a <del>b <del>c</del> d</del> e</p>',
+    'should support nested strikethrough'
+  )
+
+  t.deepEqual(
+    micromark('a ~-1~ b', {
+      extensions: [syntax],
+      htmlExtensions: [html]
+    }),
+    '<p>a <del>-1</del> b</p>',
+    'should open if preceded by whitespace and followed by punctuation'
+  )
+
+  t.deepEqual(
+    micromark('a ~b.~ c', {
+      extensions: [syntax],
+      htmlExtensions: [html]
+    }),
+    '<p>a <del>b.</del> c</p>',
+    'should close if preceded by punctuation and followed by whitespace'
+  )
+
+  t.end()
+})
diff --git a/test/input.md b/test/input.md
new file mode 100644
index 0000000..1f01832
--- /dev/null
+++ b/test/input.md
@@ -0,0 +1,137 @@
+# Strike through / delete
+
+## Balanced
+
+a ~one~ b
+
+a ~~two~~ b
+
+a ~~~three~~~ b
+
+a ~~~~four~~~~ b
+
+## Unbalanced
+
+a ~one/two~~ b
+
+a ~one/three~~~ b
+
+a ~one/four~~~~ b
+
+***
+
+a ~~two/one~ b
+
+a ~~two/three~~~ b
+
+a ~~two/four~~~~ b
+
+***
+
+a ~~~three/one~ b
+
+a ~~~three/two~~ b
+
+a ~~~three/four~~~~ b
+
+***
+
+a ~~~~four/one~ b
+
+a ~~~~four/two~~ b
+
+a ~~~~four/three~~~ b
+
+## Multiple
+
+a ~one b one~ c one~ d
+
+a ~one b two~~ c one~ d
+
+a ~one b one~ c two~~ d
+
+a ~~two b two~~ c two~~ d
+
+a ~~two b one~ c two~~ d
+
+a ~~two b two~~ c one~ d
+
+## Flanking
+
+a oneRight~ b oneRight~ c oneRight~ d
+
+a oneRight~ b oneRight~ c ~oneLeft d
+
+a oneRight~ b ~oneLeft c oneRight~ d
+
+a ~oneLeft b oneRight~ c oneRight~ d
+
+a ~oneLeft b oneRight~ c ~oneLeft d
+
+a ~oneLeft b ~oneLeft c oneRight~ d
+
+a ~oneLeft b ~oneLeft c ~oneLeft d
+
+***
+
+a twoRight~~ b twoRight~~ c twoRight~~ d
+
+a twoRight~~ b twoRight~~ c ~~twoLeft d
+
+a twoRight~~ b ~~twoLeft c twoRight~~ d
+
+a ~~twoLeft b twoRight~~ c twoRight~~ d
+
+a ~~twoLeft b twoRight~~ c ~~twoLeft d
+
+a ~~twoLeft b ~~twoLeft c twoRight~~ d
+
+a ~~twoLeft b ~~twoLeft c ~~twoLeft d
+
+## Interleave with attention
+
+a ~~two *emphasis* two~~ b
+
+a ~~two **strong** two~~ b
+
+a *marker ~~two marker* two~~ b
+
+a ~~two *marker two~~ marker* b
+
+## Interleave with links
+
+a ~~two [resource](#) two~~ b
+
+a ~~two [reference][#] two~~ b
+
+a [label start ~~two label end](#) two~~ b
+
+a ~~two [label start two~~ label end](#) b
+
+a ~~two [label start ~one one~ label end](#) two~~ b
+
+a ~one [label start ~~two two~~ label end](#) one~ b
+
+a ~one [label start ~one one~ label end](#) one~ b
+
+a ~~two [label start ~~two two~~ label end](#) two~~ b
+
+[#]: #
+
+## Interleave with code (text)
+
+a ~~two `code` two~~ b
+
+a ~~two `code two~~` b
+
+a `code start ~~two code end` two~~ b
+
+a ~~two `code start two~~ code end` b
+
+a ~~two `code start ~one one~ code end` two~~ b
+
+a ~one `code start ~~two two~~ code end` one~ b
+
+a ~one `code start ~one one~ code end` one~ b
+
+a ~~two `code start ~~two two~~ code end` two~~ b
diff --git a/test/output.html b/test/output.html
new file mode 100644
index 0000000..33d849d
--- /dev/null
+++ b/test/output.html
@@ -0,0 +1,68 @@
+<h1>Strike through / delete</h1>
+<h2>Balanced</h2>
+<p>a <del>one</del> b</p>
+<p>a <del>two</del> b</p>
+<p>a ~~~three~~~ b</p>
+<p>a ~~~~four~~~~ b</p>
+<h2>Unbalanced</h2>
+<p>a ~one/two~~ b</p>
+<p>a ~one/three~~~ b</p>
+<p>a ~one/four~~~~ b</p>
+<hr />
+<p>a ~~two/one~ b</p>
+<p>a ~~two/three~~~ b</p>
+<p>a ~~two/four~~~~ b</p>
+<hr />
+<p>a ~~~three/one~ b</p>
+<p>a ~~~three/two~~ b</p>
+<p>a ~~~three/four~~~~ b</p>
+<hr />
+<p>a ~~~~four/one~ b</p>
+<p>a ~~~~four/two~~ b</p>
+<p>a ~~~~four/three~~~ b</p>
+<h2>Multiple</h2>
+<p>a <del>one b one</del> c one~ d</p>
+<p>a <del>one b two~~ c one</del> d</p>
+<p>a <del>one b one</del> c two~~ d</p>
+<p>a <del>two b two</del> c two~~ d</p>
+<p>a <del>two b one~ c two</del> d</p>
+<p>a <del>two b two</del> c one~ d</p>
+<h2>Flanking</h2>
+<p>a oneRight~ b oneRight~ c oneRight~ d</p>
+<p>a oneRight~ b oneRight~ c ~oneLeft d</p>
+<p>a oneRight~ b <del>oneLeft c oneRight</del> d</p>
+<p>a <del>oneLeft b oneRight</del> c oneRight~ d</p>
+<p>a <del>oneLeft b oneRight</del> c ~oneLeft d</p>
+<p>a ~oneLeft b <del>oneLeft c oneRight</del> d</p>
+<p>a ~oneLeft b ~oneLeft c ~oneLeft d</p>
+<hr />
+<p>a twoRight~~ b twoRight~~ c twoRight~~ d</p>
+<p>a twoRight~~ b twoRight~~ c ~~twoLeft d</p>
+<p>a twoRight~~ b <del>twoLeft c twoRight</del> d</p>
+<p>a <del>twoLeft b twoRight</del> c twoRight~~ d</p>
+<p>a <del>twoLeft b twoRight</del> c ~~twoLeft d</p>
+<p>a ~~twoLeft b <del>twoLeft c twoRight</del> d</p>
+<p>a ~~twoLeft b ~~twoLeft c ~~twoLeft d</p>
+<h2>Interleave with attention</h2>
+<p>a <del>two <em>emphasis</em> two</del> b</p>
+<p>a <del>two <strong>strong</strong> two</del> b</p>
+<p>a <em>marker ~~two marker</em> two~~ b</p>
+<p>a <del>two *marker two</del> marker* b</p>
+<h2>Interleave with links</h2>
+<p>a <del>two <a href="#">resource</a> two</del> b</p>
+<p>a <del>two <a href="#">reference</a> two</del> b</p>
+<p>a <a href="#">label start ~~two label end</a> two~~ b</p>
+<p>a ~~two <a href="#">label start two~~ label end</a> b</p>
+<p>a <del>two <a href="#">label start <del>one one</del> label end</a> two</del> b</p>
+<p>a <del>one <a href="#">label start <del>two two</del> label end</a> one</del> b</p>
+<p>a <del>one <a href="#">label start <del>one one</del> label end</a> one</del> b</p>
+<p>a <del>two <a href="#">label start <del>two two</del> label end</a> two</del> b</p>
+<h2>Interleave with code (text)</h2>
+<p>a <del>two <code>code</code> two</del> b</p>
+<p>a ~~two <code>code two~~</code> b</p>
+<p>a <code>code start ~~two code end</code> two~~ b</p>
+<p>a ~~two <code>code start two~~ code end</code> b</p>
+<p>a <del>two <code>code start ~one one~ code end</code> two</del> b</p>
+<p>a <del>one <code>code start ~~two two~~ code end</code> one</del> b</p>
+<p>a <del>one <code>code start ~one one~ code end</code> one</del> b</p>
+<p>a <del>two <code>code start ~~two two~~ code end</code> two</del> b</p>